Implemented a Builder pattern for EventuallyConsistentMaps.
EventuallyConsistentMap has been moved to the API package so is now available outside the stores.
ONOS-1357
Change-Id: I1c892eb3dbefa72cb3f3eb3ccc74e9a02c7e2ac9
diff --git a/core/api/src/main/java/org/onosproject/store/service/ClockService.java b/core/api/src/main/java/org/onosproject/store/service/ClockService.java
new file mode 100644
index 0000000..a0de0a9
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/store/service/ClockService.java
@@ -0,0 +1,35 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.store.service;
+
+import org.onosproject.store.Timestamp;
+
+/**
+ * Clock service that can generate timestamps based off of two input objects.
+ * Implementations are free to only take one or none of the objects into account
+ * when generating timestamps.
+ */
+public interface ClockService<T, U> {
+
+ /**
+ * Gets a new timestamp for the given objects.
+ *
+ * @param object1 First object to use when generating timestamps
+ * @param object2 Second object to use when generating timestamps
+ * @return the new timestamp
+ */
+ public Timestamp getTimestamp(T object1, U object2);
+}